Protocol 3.0 Part A. Admin-configurable, per-feature and per-field
audience control over every shard-derived surface, replacing the static
PUBLIC_KINDS allowlist that used to be the whole boundary.
- SHARD_VISIBILITY.md (new): the admin-facing guide - the ladder, what
each of the ten features exposes, the defaults, the two rules that are
code rather than configuration, and worked examples.
- BACKEND_DESIGN.md 6.5 (new): the same thing as a security contract -
the ladder and how viewerLevel resolves it, the locked acct/webId rule,
the fail-closed kind map, the asymmetric ladder fallbacks, and the
three enforcement points. Plus the shard_feature_visibility schema, the
/public/shard/features route, and the adminOnly tier on
/admin/shard/visibility.
Defaults reproduce pre-3.0 behavior everywhere, with one deliberate
exception which is the leak Part A was written to close: guilds and
governors previously returned the raw stored payload, whose leader and
governor actors carry acct and webId, to anonymous callers.
Co-Authored-By: Claude <noreply@anthropic.com>
